* @param Function callback (optional) A function to be executed whenever the animation completes.\r
* @cat Effects/Animations\r
* @see fadeOut(String|Number,Function)\r
* @see fadeTo(String|Number,Number,Function)\r
*/\r
* @param Function callback (optional) A function to be executed whenever the animation completes.\r
* @cat Effects/Animations\r
* @see fadeOut(String|Number,Function)\r
* @see fadeTo(String|Number,Number,Function)\r
*/\r